Need some help for the 3rd and 4th requirements.

Question about the task

Under discussion

The test files results seems all right, but can't pass the verification. So confused for this task. Please give me some help. Appreciate it.

Read 2 file names from the console.
The first file contains real (fractional) numbers, separated by spaces. For example, 3.1415.
Round the numbers to integers and write them, separated by spaces, to the second file.
Close the streams.

The rounding should work like this:
3.49 => 3
3.50 => 4
3.51 => 4
-3.49 => -3
-3.50 => -3
-3.51 => -4

Requirements:

The program should read a file name twice from the console.
Create an input stream for the first file. Create an output stream for the second file.
Read the numbers from the first file, round them, and write them to the second file, separated by spaces.
The rounding must be performed as indicated in the task.
The file streams must be closed.

package com.codegym.task.task18.task1820; import java.io.*; //import java.lang.String; /* Rounding numbers */ public class Solution { public static void main(String[] args) throws Exception{ BufferedReader reader=new BufferedReader(new InputStreamReader(System.in)); String fn1=reader.readLine(); String fn2=reader.readLine(); File f1=new File(fn1); File f2=new File(fn2); FileInputStream f1_i=new FileInputStream(f1); FileOutputStream f2_o=new FileOutputStream(f2); byte[] readb=new byte[f1_i.available()]; f1_i.read(readb); f1_i.close(); String reads=new String(readb,"UTF-8"); String[] readsp=reads.split(" "); int[] result=new int[readsp.length]; for(int i=0;i<readsp.length;i++){ float n=Float.parseFloat(readsp[i]); int temp=Math.round(n); result[i]=temp; } int tew=0; for(int j=0;j<result.length;j++){ if(result[j]<0){ f2_o.write('-'); tew=Math.abs(result[j]); }else{ tew=result[j]; } f2_o.write('0'+tew); if(j<result.length-1){ f2_o.write(' '); } } f2_o.close(); } }

Comments (3)

Popular
New
Old

You must be signed in to leave a comment

Bill Nguyen

Level 22 , Ho Chi Minh, Vietnam

6 August 2019, 04:59

I have another idea to solve this problem. Have a great day, guys!

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        // create file input stream
        FileInputStream file1 = new FileInputStream(reader.readLine());
        // create file output stream
        FileOutputStream file2 = new FileOutputStream(reader.readLine(), true);
        reader.close();

        String doubleString = "";
        while(file1.available() > 0) {
            int data = file1.read();//read letter from file1
            char c = (char) data;// change int to character
            String temp = String.valueOf(c); // change character to String
            doubleString += temp;
        }

        String[] doubleStringArr = doubleString.split(" ");
        String tempRoundString = "";
        for (String e : doubleStringArr) {
            double d = Double.parseDouble(e);
            tempRoundString += Math.round(d) + " ";
        }

        String RoundString = tempRoundString.substring(0,tempRoundString.length()-1);
        for (int i = 0; i < RoundString.length(); i++) {
            char c = RoundString.charAt(i); //change string to character
            int letter = c; // change character to int
            file2.write(letter); // write int base on Ascii code
        }

Nithin

Level 35 , Hyderabad, India

22 July 2019, 09:07

#1 : in line 27 you should split it by means of newline not space. #2 : it is better if you use double in place of float on line 30.

String[] readsp=reads.split("\n");
        int[] result=new int[readsp.length];
        for(int i=0;i<readsp.length;i++){
            double n=Double.parseDouble(readsp[i]);
            int temp=(int) Math.round(n);
            result[i]=temp;
        }

Jackgai

Level 26 , Tokyo, Japan

22 July 2019, 10:23

Appreciate for your help. After modifying the code according to your suggestions, the last three requirements can't be verified. The error message shows "Bear in mind that the file may contain integers". I tried to insert some integers like "1 2 3" in my test file, then the same integer "1 2 3" shows in the output file.